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Etude des variations de pression intracochléaires chez le cobaye exposé à des bruits impulsifs

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A preliminary investigation based on an electric circuit model has shown that the characteristics of the middle ear may contribute to a reinforcement of the cochlear excitation. This reinforcement could be a function of the duration of the applied acoustic impulse e.g. noise from firearms.

Direct measurements of the intra-cochlear overpressures performed with the aid of transducers implanted in the first turn of the cochlea of guinea pigs have confirmed these effects to which must be added those originating from the external ear. A reinforcement is produced for a duration of approximately 50 to 60 μs of the first positive phase of the incident air wave.

These results could give a better understanding of the lesional mechanisms of acoustic trauma.

Sommaire

Une étude préliminaire basée sur un modèle électrique a montré que les caractéristiques de l'oreille moyenne peuvent être à l'origine de renforcements de l'excitation cochléaire pour des stimulations impulsives du type «bruit d'arme» ayant une certaine durée.

La mesure directe des surpressions à l'aide de capteurs implantés dans le premier tour de la cochlée de cobayes confirme cet effet auquel s'ajoute celui de l'oreille externe. Un renforcement se produit pour une durée de la première phase positive de l'onde aérienne incidente de l'ordre de 50 à 60 μs.

Ces résultats devraient permettre de mieux comprendre les mécanismes lésionnels des traumatismes acoustiques.

Zusammenfassung

Eine Voruntersuchung anhand eines elektrischen Modells hat gezeigt, daß aufgrund der charakteristischen Eigenschaften des Mittelohres eine verstärkte Erregung der Cochlea bei impulsartigen Reizen nach Art eines Knalls auftreten kann.

Die direkte Messung der Überdrucke mit Druckaufnehmern, die in der Basalwindung der Cochlea von Meerschweinchen eingepflanzt waren, haben diesen Effekt bestätigt, zu dem noch die Wirkung des Außenohrs hinzutritt. Eine Verstärkung tritt auf, wenn die Dauer der ersten positiven Phase der einfallenden Druckwelle etwa 50 bis 60 μs beträgt.

Diese Ergebnisse sollten ein besseres Verständnis des Verletzungsmechanismus bei akustischen Traumata ermöglichen.
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Document Type: Research Article

Publication date: August 1, 1978

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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